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    <title>登陆效果</title>

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        <h2>选择您需要的难度</h1>

        

            <a href="./page/1.html"><button>关卡一</button></a>

            <a href="./page/2.html"><button>关卡二</button></a>
            <a href="./page/3.html"><button>关卡三</button></a>

       

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